Hello Murali
Yes, giving improvement exams is your choice and it depends on you whether you want to give improvement exams or not and for which subjects you want to appear.
So, it's completely your decision that which subject do you want to sit for improvement. If you feel that a specific subject improvement exam would boost your percentage, then even only would be suffice.
So, you need not to worry about that.
Hope this has answered your query.

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